Average annual temperature is 12.1 °C
Absolute maximum temperature: 36.0 °C
Absolute minimum temperature: -21.6 °C
Number of sunny days: 204 days
Number of rainy days: 145 days
Number of snow days: 16 days
Look at detailed online map of Rock Island Arsenal
* Weather data for Rock Island Arsenal United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 13.2 | 11.9 | 22.5 | 26.0 | 32.7 | 34.7 | 35.2 | 36.0 | 33.2 | 29.6 | 18.4 | 14.2 |
| Average daytime temperature (°C) | 3.0 | 5.6 | 8.6 | 17.6 | 25.1 | 29.7 | 29.3 | 28.6 | 25.9 | 17.9 | 10.3 | 7.1 |
| Average temperature (°C) | -1.2 | -0.1 | 3.3 | 10.8 | 18.4 | 23.4 | 24.0 | 23.6 | 20.5 | 13.4 | 5.5 | 3.2 |
| Average night temperature (°C) | -4.2 | -4.6 | -0.5 | 5.4 | 12.2 | 17.3 | 19.0 | 19.1 | 16.1 | 9.7 | 1.6 | 0.6 |
| Absolute minimum temperature (°C) | -21.6 | -18.8 | -11.7 | -1.2 | 3.4 | 10.1 | 14.7 | 12.2 | 10.9 | -2.3 | -11.1 | -7.5 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 |
| Daylight mean duration (h) | 9.6 | 10.6 | 11.9 | 13.3 | 14.5 | 15.1 | 14.8 | 13.8 | 12.5 | 11.1 | 9.9 | 9.2 |
| Daylight minimum duration (h) | 9.0 | 10.0 | 11.0 | 12.0 | 13.0 | 14.0 | 14.0 | 13.0 | 11.0 | 10.0 | 9.0 | 9.0 |
| Sunshine mean duration (h) | 3.8 | 7.2 | 6.7 | 9.3 | 11.4 | 12.4 | 12.5 | 11.1 | 9.7 | 7.4 | 7.3 | 4.2 |
| Precipitation (mm) | 73 | 92 | 93 | 52 | 45 | 30 | 99 | 48 | 89 | 74 | 22 | 66 |
| Sunny days | 15 | 16 | 14 | 18 | 23 | 19 | 15 | 15 | 14 | 16 | 23 | 16 |
| Rainy days | 8 | 9 | 16 | 12 | 8 | 11 | 16 | 16 | 16 | 14 | 5 | 14 |
| Snow days | 8 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 2 | 1 |
The best time to visit Rock Island Arsenal during the most sunny months:
The largest precipitation sum in Rock Island Arsenal is at